wg-performance Status Update 2022-01-17

[erwinmombay]

What was accomplished

Lessons Learned

What's Next

[samouri]

What was accomplished

typescript migration We can now write seamlessly write TypeScript. More info re. migrating Bento to come this week.

• https://github.com/ampproject/amphtml/pull/37324
• https://github.com/ampproject/amphtml/pull/37378
• https://github.com/ampproject/amphtml/pull/37374
• https://github.com/ampproject/amphtml/pull/37370
• (in progress): https://github.com/ampproject/amphtml/pull/37387

ssr

• https://github.com/ampproject/amphtml/pull/37358
• (in progress) extraction of createContainer for PreactBaseElement:
• (in progress) system for serializing event handlers to be able to unit test component hydration: https://github.com/ampproject/amphtml/pull/37389

other

• https://github.com/ampproject/amphtml/pull/37353
• https://github.com/ampproject/amphtml/pull/37341
• https://github.com/ampproject/amphtml/pull/37340
• https://github.com/ampproject/amphtml/pull/37327
• https://github.com/ampproject/amphtml/pull/37326
• https://github.com/ampproject/amphtml/pull/37296
• Discussion around simplifying various aspects of Bento (unnecessary helpers .e.g dict, class structure)

Lessons Learned

Last week we had feared that esbuild may be transpiling our esm since we set target to es6. We don't want esbuild to transpile anything. Via inspecting esbuild source and verifying with a PR (https://github.com/ampproject/amphtml/pull/37375), confirmed that this isn't happening. We can set target: 'esnext' with no change to any of our binaries.

What's Next

• Continuing in-progress work (Bento SSR, TS).
• Lazy-loading Bento WC half-pager.

[erwinmombay]

What was accomplished

• add ability to generate ssr ready binaries (https://github.com/ampproject/amphtml/pull/37404 in review)
• updated the insertion location of amp-story-dvh-polyfill script to be before any css to possibly mitigate CLS (https://github.com/ampproject/amp-toolbox/pull/1274)
• tested 30 urls with the amp-geo ssr server logic and tested with GB and JP geolocation through vpn

Lessons Learned

What's Next

• finish amp cache url rewriting code in amp-toolbox
• investigate CLS issues with amp-story

[rcebulko]

What was accomplished

• Bento Compiler partial traffic launch, metrics collection
• lots of TS code reviews
• https://github.com/ampproject/amphtml/pull/37362
• Phase 1 work on runtime changes for https://github.com/ampproject/amphtml/issues/37129
• Release on-duty rotation

What's Next

• Submit runtime changes for PREVIEW state
• Address latency issue in Bento Compiler
• Inspect CSI metrics for BC experiment

[alexnj]

What was accomplished

• Early and working prototype of Client A/B testing.

Lessons Learned

• Colliding multi-arm tests are difficult to achieve with text-based DOM diffs, marking most of the previous proposal as obsolete.

What's Next

• Identify example archetypes examples (SSR, SPA) to validate and benchmark the prototype.
• Complete the prototype and document the new proposal.
• Investigate cache usage discrepancy in Web Stories.

[jridgewell]

What was accomplished

• Handle individual failures when transcoding images: cl/421700386
• https://github.com/ampproject/amphtml/pull/37312
• Attempt to add post-esbuild babel transpilation (but might be unnecessary): https://github.com/ampproject/amphtml/pull/37313

Lessons Learned

• C++ without Google's IDE is terrible.

What's Next

• WASM Jolt prototype
• Open CSI project slidedeck
• Quick TC39 meeting